adding cooldown to other spells because another spell (that is generally used as a protective spell) had cooldown added, doesnt make sense? it's like that in almost every mmorpg's these days; wow has cool down on just about every spell/skill, LOTR online, Guild Wars, Sacred, even Lineage.
like i said, really think about it (and this time for longer than 2 minutes.) it MAKES sense to add cooldown to other spells if you're adding it to another; it keeps everything fair, while still making it a challenge.